Tunnel Ram 383

This will be a street car, with a possible trip to the strip to see what it will do.
Bottom line is I like to drive this thing as much as possible.

It has a 3.23 Sure Grip.
Tires are 245/60/R14, (fronts are 215/70/R14 if it matters).

The heads on the car now are 915s, which I understand are closed chamber.
I can certainly use those if the 452s would not make sense.

I understand what a cam does and the concept, (lift, duration, etc), yet I know I am not educated enough to make a good choice here.

So do open chamber heads give a higher compression ratio, aka lack of compression, and a lower number is required for a tunnel ram?

Is a well balanced combination possible with the tunnel ram?

I read a lot of comments on running a tunnel ram, most people frown on them but they have never run one, and those that have say it just takes a little more attention to tuning the carbs to get it right.

I have been reading as much info as I can find, but I cannot locate info on the crank issue. If I disassemble the engine and bring the crank to a machine shop, can I just reassemble it using the same bearings?

Is this 4 speed crank issues something a machine shop should know about, and know how to correct?
I guess I’ll find out.