Converter Stall Calculations and or Calculator

Guys I am asking about how I can run numbers (of variables everyone asks me abut that I don’t have like cam profile and exact compression ratio) and look at what if scenarios to see what stall numbers come out. Just so I can learn how those variables are used. There has to be a reason I am asked about CR, Cam Profile car wt diff ratio tire size etc. How are these numbers used? I get the feeling it’s mostly opinion based on experience and not a calculated estimation ....too much or too little stall leads to power loss efficiency and heat. Just wondering if there is a calculator to plug these variables into.......

That being said I probably will go with your recommendations that is a 9” or 10” 3500. After I get my 3:55’s in.

I see 3500 stall converters like $500 to $800 which is not what I call cheap.

@Oldmanmopar what is cheap and what is the source?

Car is my 1970 Plymouth Sport a Satellite has a big cam 340 high rise M1 manifold Holley 3150 650 DP and A904 trans. Long tune headers with glass packs. Estimated weight is 3200lbs. Unknown cam and CR. Tires are 15” an are total 25” diameter. HP/TQ estimated? You tell me.....
See it run here