So I'm picking up a 74 Triumph TR6 this weekend and I have a good idea of what to do with it over the next couple of days. Just wanted to see if anybody had in good ideas other than these to get it running. FYI, it was running when parked.
pull fuel lines off carbs and hit with carb cleaner 3-4 times
pull plugs and spray pb blaster/atf down holes 3-4 times
drain gas tank, check for rust
fill with fresh cheap oil/filter/ plus some Marvel for sludge
Yeah, that looks like a pretty good checklist for the engine. I would flush the brakes and grease up the slider pins too. Work the brakes a bit before you take that beast on the road and find out you can't stop. Don't those ZS carbs have oil in them? Not sure if you have to do something with them or not. If this is going to be your car a carb update (Webber) is the first thing I would do.
Oh, be wary of the rotted tires too. I would probably do this:
remove plugs and unplug coils
turn over by hand
turn over by starter
turn over by plugs/coils
make sure you build oil pressure before starting with the plugs
I've done a fairly significant amount of resto work on TR6's professionally (and owned it's little brother the GT6) and between your original post and Bob's you about have it covered.
Unless you're very lucky you will be rebuilding ALL the hydraulics (clutch and brakes) pretty shortly, Brit hydraulics from that era don't like sitting for extended periods so be sure to test the brakes before going out on the street and BE SURE the emergency brake works.
One thing I will disagree on is putting a Weber carb on it. I've seen and worked on a fair number of the downdraft 2 barrel conversions (DGV usually) and they almost never run well. IMHO the progression circuits in the carb just aren't right for that particular engine. If you're going to go Weber go DCOE, just be prepared for a LARGE check written.
The suggestion to EFI it is honestly your best bet. There is a guy making TBI units from the ZS carbs with a reprogrammed GM controller though I think an MS with TBIs would be a better idea. If you're interesetd I'll dig up his contact info for you. Another route to EFI would be to source a TR6 PI/2500PI intake manifold from the UK and adapt it to electronic injectors. TR6's came injected in Europe, but it's an oddball Lucas system that's sort of a cross between Bosch CIS and Kugelfischer mechanical. With the PI cam the TR6 was rated at 150hp vs the 117 or so the carbed cars had.
The electrics rarely give trouble on TR6's, Lucas has a much worse rep than my experience has shown to be reality. About the only thing I'd be inclined to change is the starter, mostly because the gear-reduction aftermarket starters spin the engine a little faster and draw less current which gets the car started a little easier. The other thing I'd change eletrically is to throw a Pertronix in to replace the points, they're much nicer and don't change timing since they don't wear.