Yeah, the later ones when they went crazy with the emissions stuff are a pain.

What RPM range you want to use? Even a basic dual plane like the performer should be good for a 6000 rpm shift. Plus I think it would help with vacuum signal (idle and brakes). two VERY important things on a huge car... LOL

We had a different 340 TQ, not sure what it was about it, one of most rock solid and reliable carbs I've ever seen. but they just aren't all like that, and it's probably luck more than anything