Cut the intake side of the heads instead of the intake,otherwise that intake will most likely only fit on that motor combo,also allows you to try a different intake if you want.
I tried a set of late 60's vintage 14x7 wheels and they hit my tie rod ends, I picked up a set of 15x6 wheels from a wagon that don't hit.Just my 2 cents.
I had a 70 Chevelle SS 454 LS6 back in the late 70's that had 4.10's and a 4 speed, that motor really came on at 3500 revs and pulled hard to about 6300 revs,It was stock except for a set of headers and a Torker intake.
"Worthless as a screen door in a submarine"
"I'm so poor I can't pay attention"
" We're in good shape for the shape we're in"
" Drive it like you stole it"
Made some progress on the car after 6 months of downtime due to an injury/surgery,finished the last of the sand blasting and painted the floor,also picked up a 1958 tripower with original carbs.