Ok

New on here ... Hear me out I picked up a 1956 customline that I'm trying to get running / slow restore for my dad

Pulled the seized 292 out that was I. There and put in a "it ran" 272 so numbers matched... Cleaned it al up and gasket kitted the motor... With shit head gaskets it pulled 30psi all cylinders placed back in car and wired everything up had some issues with distributor points but got spark... Pulling 70~ psi all cylinders. Its timing seems right per timing light manually feel for TDC and checking marks... Cranks over and sounds good cranking speeds up like it wants to fire and then back to normal cranking...

15486372 firing used
New plugs & wires
New oil
Carb rebuilt but using starting fluid
Psi 70~

Will try and post video of what it's doing