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Dick-- 1956 Chevy 2x4 manifolds #3728725 1st design and 2nd design #3731394 manifolds with 4 individual holes for carb barrels(1956 only and very very early 1957) versus #3739653 (1957-1961) which had 2 holes and one large figure 8 hole for each carb are available for anywhere from $200 to $700-$ 800 depending on condition and who you buy them from. Carbs(2419s & 2362s) are priced all over the place again condition is the pricing factor here...might do this piecemeal and get what you can afford now and as $$$$$ permits make a purchase of the rest of the parts as you go along---pay particular attention to bolt holes( manifold to head) on engines that have been decked the bolt holes will generally crack at 4 & 8 oclock positions ya hafta look very carefully---also look under the oil shield the tend to rot out in there - plus the heater hose nipples usually are rusted into the manifold very touchy repair to do properly----Comp