y car has 720 will these work or will I need to upgrade

Oh yeah, 1250's minimum.

1200cc just incase you want to go E85 later

you cannot run a 1200cc injector on a fp green on pump gas so thats just a dumb thing to say

stick with the 720cc on pump gas. they are fine

I don't want e85 can't get it in panama

I do plan on running c16 and my block is fully forged and head is ported with kelford cams with valves and springs

Is yours the older original Green turbo, or the newer, HTA Green. The 720's should be o.k. on pump and/or race gas as if it is an Old-School Green. If, on the other hand it be an HTA Green then you will need a larger injector.

fic 1050cc should be good

you'd be fine with the 720's, and 1200's with a green, that's fine. you can run any size injector you want, it's all about your idc's, you'll just be left with a lot of headroom for your next mod

Did you just imply that Curt Brown is dumb ??? EvoJoeIX - You really need to do a bit more reading before you give advice.

I run 1200's on 91 octane without any issues...

TO OP - Per Curt's and others recommendations, you should get 1200 + so you'll have plenty of room should you choose to run e85, push your turbo hard, or get a larger turbo in the future. It sounds like you'll want to push the HTA Green and per Curt's (and my) data, you'll want an injector 1200 or larger.

I tried running E85 at 28 psi and was at 100% duty cycle before 6000 rpm on a single 255HP(modified) and FIC 1680's, on 5 gallons 93 octane(probably E10 or E15) and one gallon E85 I was at 108.8% DC at 8000 RPM FP Green HTA creeping to 30psi, of course this is on a FULLY optimized set-up. Now through a BR double pumper in there and all will be good. 1250's will be OK on a single pump if you don't push the envelope.

750 should be fine for pump ...

WRONG, unless you want to limit the turbo with fuel limitations ....The HTA Green is a 55lb + turbo and capable of 500+ whp. Simple calculations would tell you a 900cc injector would be at ~80+% and my real life experiences tell me a 1200 + injector would be a wiser choice.

i was recommended to run 850 or 880's by maperformance to run on the 73hta green on pump gas

the question was .

yes they would work .. those could take him to 450 area depending on Fuel pressure . If that all he has for them awesome .. now if he is going to buy a new set .. assuming he is only running maybe 93oct and 1 fuel pump .. 880's would be my choice ... even at that he would run out of pump before injector ..