Really need to figure out which way you want to go first, spray,turbo, 302, 351. Yuo get bigger runner/ cc heads if you intend on go with a turbo but you def. dont want to cut them down to make them work with existing combo or you'll be lookin for heads when/if you put a turbo on it.
I personally would not buy pedestal mount heads becusea of versatility and adjustability for future modifications or changes in combo if you chooose to.