[Jack21]

FFR's are somewhat different animals than most other Cobras. For one, fitting anything bigger than a 302 block requires some shoehorning. Most of the FFR types I know stick with 302 blocks, add stroker kits to up the displacement and superchargers to up the power. This is a question better put to FFR owners.

Any other Cobra, wouldn't consider anything less than a 351W.

For street use, the T-5Z is a great trans. Better gearing. If building a 393W and were planning on leaning on it hard, would go with G-Force built T-5Z. Again, better gearing than Tremec.