hi i have a 1963 pannel van(4160lbs)
i resently have a machine shop build a motor
for me ,blue print balanced,and bored
roller cam howard 0 lash
373 rear end grear
vac plugged on carb and distrib.
i had the timing at 38 degr.
now it's 34 deg runs better and cooler now
when its cold it back fires a little (very little)
driving down road when under 180' (temp) it does it
when 200deg it runs fine fine
and the oil temp is at 70 psi when temp is at 200 it drops to
40 ( in has a high per pump.)
any thoughts thanks