Still working on the shake at launch issue I have with my stock 69 Barracuda Formula S 383 4 speed car. Just a question concerning the bell housing. If the Parallelism of the tranny mounting surface or the concentricity to the crankshaft were out of spec. would that cause an intermittent hard shake at standstill take off? Once the car is rolling it's fine. No shifting issues. Just take off shake.

I've done lots of work on this car the past 2 years and still trying to pinpoint this issue. All the obvious stuff and then some. Thinking more out of the box at this point.

Thanks.