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Bill,
Congrats on making a deposit on an ERA Slab side! Doug and Peter along with owners like Jim can certainly provide you guidance. Peter's basic advice is not to stray too far from the original recipe, so to speak, and ERA has been at this a very long time.
For my FIA 'street' car, they recommended the 3.54 rear ratio with the TKO 600 & 0.82 OD. It works well with the 302 (306) motor putting out 365 HP and I am very happy with it. There are a lot of factors to consider, but doing the research and figuring things out is half the fun!
- Tim
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