LA360 compression

Like mopowers said;
your Mabco block,
Your S master heads,
A small cam, ( smaller than factory 340 #’s),
Small 4 b,
Heck, even manifolds will work!
You will be able to fry the tires at the light with what you have.
Even a 360 2bl cam will accept a small 4 bl or a sb tq and not lose bottom end torque.( if you don't over carb )
Remember, 360 have a different stroke than a 318 so they came factory with bottom end torque.
Build what you have and it will work on reg fuel also.
If you want to have fun on the street it sounds like you have almost everything you need.
If you want to 1/4 mile then do what your engine builder is suggesting.
I’m sure he can build a honkin motor but we just don't want to see you spend more money when you can get in plenty of trouble with the law with what you have to work with.
Less is more.

…So excited for a big red X