I would stiffen up your chassis. If you still have leaf springs and no GOOD traction device thats part of tour problem. I have an 88 gt and I gained a full second just by puting in subframe conectors and a cage. Before I used to pull one wheel off the ground and now I pull both. You are losing alot of power in chassis flex. I'm building a 66 coupe at this time and its getting sub frame conectors, cage, and ladder bar rear suspension. I hope this helps.
JAY
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