All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
This is a question can be answered in many different ways. What do you want to build? other than that get all the machine work done with the block, and whats wrong with the heads that it has? have a shop do a 3 angle valve job on them, clean them up, clean up the block. and just get a good top end intake
With a 383 you are looking at replacing your rotating assembly, and then getting the block machined to accept the clearances. I found a used 350 vortec, problem is with vortec heads you can only put so much lift from the am without machining those as well... And at that point you can just about do anything with any head... Vortecs also take different intakes 8 bolts instead of 12...You may do a serpentine swap too- worth it in my opinion.