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The only cams I sell that require head modification are the race/boost type, XFI lobe cams. You can run over .640 lift on stock heads with the right springs. The race cams need the stiffest spring I have, and those need the seat pressure lowered by increasing the install height. This is done by cutting the seat pockets down on the head. You can run the strip cam with the comp 26986 springs on an otherwise stock head.
Stock retainers and keepers are fine. Manley are closer tolerance, and lighter. The pushrods depend on the lifter preload. There is a difference between what can be ran, and what is best for performance. The mpg, street, and street/strip cam can easily be ran on the stock pushrods, but you will be .020 to .030" short on preload. This means you are giving up duration and lift.
So no matter what company you go with, you will need new pushrods for the best performance.
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