Sum-6900 cam in 1990 360

you can interchange the cam and lifters and pushrods
you do go backwards
the summit cam is at advertised .004 like crane
you can find and compare in the list I posted in the 318 cam sticky thread
if you have the roller lifters a take out/ pick a part early 5.2 magnum cam would be the best answer
but since you own the Generic summit one grind fits all cam and area going to sell the truck price the lifters and pushrods and go for it if much cheaper than a 5.2 roller
I have the specs for the rollers I could find in the list- additions welcome