Swap mounts

With that much power, 67-72 sandwich style insulators would most likely come apart. Correction, they will come apart. You need the interlocking style insulators as a minimum because the new repros are not as good as the originals. Spool type are stronger and have the fail safe thru bolt.

Luckily I redid my suspension about 10 yrs ago using a 75-76 K member because I was originally going to go 451-4 speed using Schumacher mounts.

So I'm using TTI spool mounts and everything is going well so far with my 5.7 swap.