yep racetronix rewire with the additional upgraded chassis ground. but with the way things are going with some head work and a better cam id bet 1000rwhp is deffinately possible with a maxed out F1A, i mean look at my setup, stock valved LT4 heads/intake 8:1 355 with a off the shelf gm846 cam making 546rwhp with no fuel or spark tuning and barely touching the capabilities of the blower. throw a little more compression in there with some nasty heads/cam with a few more cubes and id bet youd crack 1000rwhp.
My father has a 02 camaro SS with a D1SC backed by a 426 LSX with the best of the best built by EPP and he cracked well over 1000 rwhp on 20psi.
im not trying to start an argument but i honestly feel if the LS1 guys can so can we

 

With the power you want, twin intanks is definely a minimum... i'd be surprised though if you hit 1000rwhp. ported LSX aftermarket heads kill ported LTX stuff. i wish you the best though and would love to see results either way!

 

the newer AFR heads are up there though. And...your forgetting jon

you can order Brodix Track 1 heads from brodix cast with the LT1 Coolant passages evens out the playing field quite a bit after you get some port work.

 

There are some heavily worked head options for us, but I don't know of many (if any that i know of) F1A LTx's making 1000rwhp. It's a big number...

 

yeah, 1000 is a big number. i know a couple 88mm cars putting it down though

03 cobra, f1a stock engine 28psi put down 712 at the wheels with nothing more but dual intanks and 60# ers

 

My car made 755/747 with a maxxed out f1a and meth. I have a bit more tuning to do, hopefully I can get over 800. I dont see much more above that happening.