My 8.2 deck 8.5 compression 363 with cleaned up 205 CNC TFS heads and a off the shelf hydraulic roller made low 500's on an engine dyno at Kaase. That was using a manifold and carb that was just laying around.
I have heads that flow about 350 cfm intake now, and a little bigger cam. It can do about 1200 RWHP with an 8280 turbo. The ET somewhat matches.
You should do more than that.
I have a friend running high 4's in a 3300 pound deal with a similar combo to yours.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)