well get the engine hot tank and mag for cracks then if ok oil it put in a bag .if you do not have a car to put the engine in .your going to need pistons to go past this point and building engine and letting them set as not that good for them less you have a heated shop .well i like to have the pistons in my hands before honing it to size. your asking about price on machine work and if its cheaper to buy new .rods heads crank .and maybe a block? so you need to know how much your machine shop is going to get to rebuild the stock rods . how much to hot tank the block .bore the block .deck it if they would tru-deck it with a BHJ fixture .or how much for deck plates when its honed .how much for the splayed caps .will the bore need to be line bored /honed with old caps any ways and at that point it may be cheaper to buy all new parts ? well i do know what i get for each job as i machine and build engines .BUT i do not know how much the shop gets your talking to. so you need to find that out.but i can tell you i re build stock rods all the time by the time you clean the rods. shot blast the rods . get ARP rod bolts .re size both ends of the rods and re face the side of a used GM rod its about the price of a scat rod . as for 350 hp all the stock parts will take that . i would buy a iron PBM thunder head .less your heads do not need much work .time is money so if your heads need guilds mill job screw in studs valve job .then parts like valves.springs seals .keeper .your just about to the price of a new iron head your going have to talk to your machine shop .then find out what shape your stuff in . i work up a price after the parts have past a mag check and are clean at that time i know how much machine work a engine is going to need