I'm thinking I put too small a cam in my 360 Magnum...

With the goals in mind, it’s not going to be an issue if you’re spraying it. Traction is going to probably be the limiting factor, so if the cam bleeds off some dynamic cylinder pressure, it will probably help more than hurt. It’s plenty of cam for the application. What’s the installed ICL? I’m guessing 216/222 @ .050 going by crane’s typical lobe profile.
For comparison purposes, my old Crane cam was 272/284 - 216/228 - .454/.480 - 112.

Summit's web site says that cam is not in stock.
Sorry, but that is super funny since Crane has been out of biz for a very long time. Of course it’s not in stock.
Rhoades fast bleed down lifters. Yeah, it’ll sound like it’s got a solid lifter cam in it then, though.
I have run them. They do what they say. Sound like a solid cam???
IDK about that.
I’d probably go with this one, then. I definitely wouldn’t want to wait for them to grind one to get to me. This wouldn’t need the Rhoades fast bleed lifters, either. The only issue may be the close to .540 lift with the magnum 1.6 rocker arms.
Howards, Hydraulic Flat Tappet Camshaft, Chrysler SB 273-360, 220/220 @ .050, .506/.506, 108 LS - Competition Products

I have this exact cam with there lifters on deck to be installed in my 5.9 with the Hughes valve springs from PAC, RPM intake/750 & Hooker 1-3/4 super comp headers into a 2-1/2 exhaust. 727 with a basic shift kit w/2500 stall, 3.55’s in 245/60/15’s.

A stock converter would be OK, not great. The 3.91’s help in a big way. Might not even notice the lack of converter to much. Even more so with the small tire.