just built a mild 350, flat valve relief pistons, crappy truck TBI heads with 64cc chambers, crane energizer 266 cam edelbrock performer intake with 600cfm crb, flowtech headers, and mallory HEI distreibutor, any guesstimates helpfull, rest of the exaust is stock using the flowtech Y pipe, and the cat is removed(no emissions testing where i live)

 

my guess would be around 190 to 200 hp

 

lol wow 60-70 under what it was rated from the box, it will outrun my buddies '89formula 350tpi rather easaly, the again he has 150,00kms on his motor

 

Told ya I was just guessing! LOL!

 

how about 375 horse.

 

I am going to say 250 HP at the flywheel as installed. The exhaust choice is killing it. The heads and cam are better suited for a TPI engine, RV or School Bus though.

 

that's what i figured, i got the old 416 heads from the original 305 that was in the car, gonna have them reworked, and the a lumpier cam, hopefully that will bring me over 300