Time to upgrade injectors, but to what size Already running RX7 460's
 

I just found out Its time to upgrade injectors, I'm running a set of RX7 460 cc injectors. My problem is when I wanted a set of 550's I couldn't find them, but now I'm finding lots of 660's and 720's. I would happily go with the 720's because they are only slightly more expensive than the 660's but e85 keeps coming up.

Anyone know of any drawback to running 720's on a 1.6 running 24psi or so (from time to time). Or would it be better to just go with e85 and find a set of 1000cc injectors. I just ordered my MapDaddy 4bar so boost is going to rise soon the question is just what fuel, and what size injectors.

My horsepower goal is 350 whp, on a 1.6.

goal hp is to be on par with a few of the turbo/v8 swap 240's and miatas i meet.