Replacing

I have a stock 65 Dart with a 273 with a four barrel Edelbrock and Performer intake manifold. Stock transmission. It was originally a two barrel engine. I am looking to order a Howard’s cam and lifter set. I do not have a factory service manual and was wondering if anyone could chime in with some factory specs. Additionally, how much more aggressive can I go considering how small that V8 is given the fact it was originally set up for a two barrel carburetor?

I believe it is a mechanical flat tappet style cam but correct me if I’m wrong.

Need to know:
Compression ratio and converter stall
Lift
Duration
Centerline

Thank you