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There are aftermarket 350 crate engines that have 1 piece RMS, Vortec heads, and provision for mechanical fuel pump. I know there are a couple from Blueprint, and probably ATK has similar configurations. However, buying a complete new crate engine puts you in the $2200-2600 range, and it sounds like you are on a relatively tight budget.This engine has everything you want, plus a roller cam, and they will dyno it to verify its 373 horsepower. https://blueprintengines.com/collections/gm-compatible-small-block-crate-engines/products/gm-350-with-vortec-heads-roller-cam-1pc-rms Just drop it in and go.Bruce
Well, the jig is like $600.............This all depends on what you want out of the engine whether to stick with the 305 or go 350........
Might be more beneficial to just add an electric pump and be done. What is your budget for this engine? If you plan on more power later on I don't see the point in sinking more money into the 305 now
Since you say 2.25 exhaust and mufflers I'm taking it as you have true duals? If so they'll be good for the 350 as that size dual pipes can handle 375. Single can only handle 187
Most people find value in time well spent and money well spent. Neither can be said for the 305 when it comes to doing upgrades. If you are maintaining a perfectly good 305, no harm no foul but when upgrading, it's lipstick on a pig. We've all heard the big fish little pond stories...no need to repeat them. It's like buying a Harley and getting a Sportster. We're all big boys now, bite the bullet and be happy, you only live once.