3.55’s and what size tire?!?!
245/60/15 in rear 215/70/14 front
Not what I would call and ideal combo myself. Even with stock sized tires.
First order is what Locomotion & Wyrmrider were getting at. Dialing in the distributor timing, then the carb tune. Getting a good and high vacuum reading should be easy enough with that OEM cam. After that, Locomotion’s idea of a 4 hole spacer is a good idea. They help deliver a little more torque.