215 60 14 is a small rear tire. I would run a 255 60 15x7 and run 3.55-3.91 gears
Also some porting with some tube Headers, with higher compression your distributor will need to be reworked. Nice combo
My runs on the highway are for 2-3 hours one-way, I am being conservitative on the gearing. I'd go 3.55 otherwise :)
Porting is outlined in a couple of my responses, it's on! Same for compression - more is better - but not too much. Headers - ah, now there's one I missed! I'm running the old MP 6/1 long-tubes now and will keep, I like them. Dist is is good shape, but will certainly need a recurve - good details @Slantsix64 !! Thank you for all your
