racing beat makes sway bars, not coil overs. he might have meant raceland
1.8 conversion kit mentioned in ad - http://www.flyinmiata.com/index.php?...umber=04-70500
- look for those parts, mainly the throttle body spacer.
ask him if he has the rest of the 2000 1.8 engine stuff (2000 throttle body is nice, 2000 cam/crank sensors are nice and can be all fit with minimum fuss!)
for your diff questions - http://www.miata.net/garage/diffguide/index.html
ask what version of megasquirt (probably MSPnP)
look for rust. get way down and hit the low part of rocker panels. they may look kind of healthy but are probably rusting.
if it doesn't have the MAZDA logo on front bumper or the 3" black beltline at the bottom, it was repainted
ask how exhaust is setup. you can mate 1.6 and 1.8 exhaust systems at a few places (manifold, adapter pipe, w/e)
ask about brakes, if it has original 1.6 ones or if they were upgraded to 1.8
ask what kind of rollbar it is. bring a caliper and measure the tubing. 1.5" is sport, 1.75" is hardcore version.