thumper cam

496dart,
An awsome time for your orange bullet.

What type of internals?

71dartstroker,
Checking into this type (20-600-4) for my 360.
I have no solid facts yet.
I am however looking into mopar p4120249 valve springs to run w/it possibly.
Doing alot of homework myself in spare time on this as I am not an engine builder...just building an engine.
Good luck.