Carb tunning/mod question

Find max initial timing setting before you bust out any drill bits. You should NOT need to drill the plates with what you have. You may be surprised that you get control over stuff by twisting the distributor housing CCW...

Slot chart

http://www.forabodiesonly.com/mopar/showthread.php?t=229240

Timing almost always affects carb, not the other way around.