Also besides the engine swap---------the 55 is 6 volt positive grd electrical system.To run the dash lites and gauges you can put an lead into the middle of the battery so as to get 6 volt for the dash--for all other lights , 12 volt bulbs are easy to get. Some early 429-460 had a power steering pump on the crank snout which eliminates a belt and accessory mount. just 12 volt alternator and a/c pump if you want to do air condition.

I would also suggest doing auto trans from the same donor vehicle-------truck trans are shorter than car trans tailshaft. Use exhaust pipes from pre 74 so not to have cats------

Will be a lot heavier unless you do a build with alum heads, manifold and radiator

And Welcome aboard