273 4bbl, carb replacement?

Good Robertshaw AWOL
not to sweat 210
but check everything
timing too advanced or retarded
vac canister and hooked to correct port
check for lean
cold air good suggestion
check out Champion LY plugs RFN12LY on low compression motor (take less timing)
radiator flushed?
how many blade fan and fan clutch?
what's the pitch on your fan?
if everything else is ok add a pusher fan
but do not use it as a band aid for poor tune or mechanicals
It will also make your AC work better in stop and go