68 Cuda 383 vs a 360

Plugs and headers are always an issue somewhere. Sometimes, it’s a zero issue, sometimes, it’s a PIA. The typical 1-5/8 small block header is a PIA on plugs 5 & 7, that’s it. On the headers I had for the bb-400, (they were Hedman B body headers-1-7/8) IIRC, it was 5 & 6 were pretty tight and a pain.

RRR is correct about weight and driving feel. While you can feel the difference, It’s not a weight that is throwing your car around uncontrollably like you have 250 sliding side to side on the nose. Upgrading the suspension is a plus to making the car handle well. I drove around a ‘71 Duster a/a 400B-727 that replaced the /6 and left in the /6 suspension up front. No sway bar stock T bars on the stock tire size. Once you learn how the car reacts, it’s fine on the road.