I have a 355 chevy

305 heads (52mm chambers)
1.6 full roller rockers
Roller cam and lifters 230° @ 0.050
350 block 0.030 over
Dish pistons
11:1 compression
Custom Sheetmetal ram intake(w/1000cfm TB)

WC t-5 w/Performance clutch

Polyurethane bushings
New torque arm
Lift bars
Tubular control arms
10-bolt (7.5 with 4.56 gears)
Strut tower brace
Comp t/a d/r

Pretty experienced driver

in my 86 Trans Am. I do not know much about weight on this car but so far the engine is coming up at about 500 horse and about 550 ft lbs. (May actually be a little bit more or less)

What estimates on times could I expect at the track on a good day?

Just gettin some ideas

 

Too many inconsistancies. I really doubt it's making 500 hp. Possibly closer to 400.

11:1 and dish pistons? 1000 CFM TB trying to flow through 305 castings? 500 hp and a T5? Cam lift with the 1.6 rockers? 4.56 gears but how tall are the tires?

Assuming everything is working properly and the T5 survives at least one trip down the track, a 12 second timeslip should be possible but without a lot more real data it's only a guess.

If you want to know what it will run then take it to the track and find out. If you're trying to build then research good working combinations before buying parts that don't work with each other. The first thing needed to build HP is heads. Stay away from production stuff since they were never designed for performance. Buy some good aftermarket castings and you'll be better off right from the start.