Removing the block will not change the ride at all .
You may have SS springs if it is sitting too high without the blocks ,
I would try better shocks first , double adjustable work best .
If it still is not what you want you can order different springs , the rear of the spring controls the...
You need to balance the front & rear diameter , Hotchkiss would match the rear & would be the best choice , or a matching diameter to the Hotchkiss bar
The real issue if you look at any newer car Alum rads are always isolated from the body in rubber mounts as they will not last very long mounted directly to the body & flexing , so brass is better unless you change the mounting for a Alum .