has any one had the engine mods done on their 502 efi (cam, head work and ecu reprog) that give 75 hp-100 hp that crockett offers ?

PM curt on the board...I believe Tyler has done some work for him.

I had mine done, All the same changes then I had him add whipples. The standard 502 upgrade produces about 500 Hp.

He raises the compression slightly, different cam and bigger valves. Recalibrate ECU and I think he includes Stainless marine exhaust.

You wont be dissapointed with Tylers quality and end result.

Tyler's quotes on HP are on the low side, if he says 75 to 100 hp, it will be more like 90 to 115 , he does top notch work, a friend of mine had some engine mods sent to him for his boat, he can do turn key , are can supply you with the parts you need and are machine work.
he stands behind his work to.

with these mods done can i run 89 octane fuel?

I would ask tyler to be sure, he dyno's his kits and would know, he does cut the heads to raise compression but he also puts in a bigger cam with more overlap so that can lower cyl. pressure a bit.