Our belvedere has a .55ish hydraulic roller and is flat done at 5500 rpm which doesn't match the 440-1 heads very well. I'm thinking about swapping the lifters to solid and some better valve springs over the winter to get a little more out of her. I'm not sure I want to do a full a cam swap.

Any thoughts on just changing the lifters and springs?

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage