pinto expert needed

[snapper]

Check static cam timing
check rocker gaps
set No.1 to TDC check rotor arm is adjacent to No.1 plug lead
check spark at plug
run engine with strobe and check idle advance, set to manufacturer recomendation
check spark advance at 3500 rpm with vacuum removed, should be 36 to 38 degs
attach vacuum and test again, should have more advance with vacuum and no load
problems now mean either the vacuum advance plate or the weights are giving problems in the distributor which you will see by strange advance using the strobe.
If none of this points to the problem then borrow a carb and try that.