Below is a list of the modifications I had to do to fit the 427 and T400 into the 88 Camaro

Use small block motor mounts on the frame side. Use the forward mounting hole locations on the cross member.

Put slots in front of cross member to access nuts on the motor mount bolts.

Use standard BBC engine side mounts.

Cut up and weld cross member (pass side) for header pipe clearance. (Hooker Super Competition for BBC in third gen p/n 520-2226 Jegs) These dump under the rocker panels on the side of the car.

Cut up & weld front subframe at the at the fire wall for header collector clearance.

Trim bottom of inner fender well for collector clearance.

Pound up floor boards for collector, muffler and exhaust clearance

Make clearance on pass side frame rail for header pipes

Modify tunnel on pass side for scatter shield clearance. The T400 alone fits.

Trim rear part of a-arms and a-arm mounting brackets (both sides) for header clearance

Reroute front brake lines inside frame rails to keep away from the headers

Cut up fire wall for HEI distributer clearance

Must run electric fans hood clearance

Fabricated upper and lower radiator mounts

With a low rise intake manifold and a short air cleaner (2") it could fit under the hood

Tall valve covers are going to hit the windshield wiper motor. Not sure how to fix this yet.

Hurst cross member mounting kit for T400 tranny and stock torque arm mounting

Additional Mods

Mount external fuel pump, filter and regulator (Holley) and added 2 3/8 NPT ports to the bottom of the gas tank

8 point roll cage (S&W Race Cars) with stock interior

5 point RCI seat belt harnesses

Switch panel

Rewire entire car except for the head light and tail light harnesses