My #1 supplier for cams is Small Engine Cams (Isky Racing Cams).
Tim Iskederian knows a thing or 2 about cams.
Give him a call and let him know what your build consist of.
The Black Mamba Jr is a VERY strong cam for daily drivers, trail busters, ridge runners, mud hole stomping builds.
It can be used as a drag race cam, but he's got much better custom cams for drag racing. The complete build has got to be built to handle those drag cams, for them to work as they were designed for.
The BMJ cam works much better then ANY cheap, junk $50-$65 cam you will find, ......there's no comparison.
It's has fast aggressive ramps, closes the intake valve very early, builds power quick, hits hard from idle to whatever rpm your build can handle.
Only needs #26 springs and stock valve train.
It's gotta lope at idle, and needs 2000+ rpm to get a nice sound, smoother idle, and instant throttle response. Works really good with 2800-3300 rpm stall. I run 3000 with mine.
Your build with the ported pred 212 non hemi head, would work good with the BMJ. That head's got a big chamber, 21-22cc, so you should have around 9.5: CR, depends on head gasket thickness, flat top piston, and piston to deck height.
A head with a small chamber will have more CR, but the BMJ will be happy and have no problems working with 9.5:1 engines.
If these engines came with the BMJ cam from the factory, cam manufacturers would be outta business and sprocket sales would be out the roof.
https://smallenginecams.com/product/104482