273 camshaft selection help

Yes, the "Lope" will come from the cam centerline. Mostly seen at 110. I would not go less than 108 on your engine. A 112 would be close to stock and smooth.

I can only assume (And I hate that) that your stock rear gears are 2.76. Do you know what they are for sure by chance? And what you would like to go up to?
Is a higher stall converter change out OK for you or maybe to be done in the future? Or do you want to keep it a stock stall converter? (Which would be fine.)

Once you know that, I'd feel alot better about making a recomendation.