318 power?

You care enough to ask so...
Ok, I get it that you're throwing it together from stuff you already had on hand, buuuuuut....

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You spent the money to get the 318 zero decked. Square to the crank? bored/honed? Why not pick up a cheap 360 block for $100 and do those same operations, that'll give you +0.090 bore and about +1/4" stroke!
340 crank? why not sell it and get a new internally balanced 360 crank with the above block? What year was the 318 block? Are you aware that the factory did use forged cranks in 318 blocks?
What kind of KB pistons? cast? hypereuctectic? forged? weight?
what rods to go with the pistons, and was the rotating assembly balanced?
heads untouched eddys, why? why not sell the eddys and get some trick flows?
hydraulic cam with adjustable rockers? why not a solid flat tappet, you're gonna have to check the rockers anyways.
is that torque converter appropriate to that cam?

If you just wanted to get it together and on the road this weekend, I get it. Your thinking and my thinking is very different when it comes to building something because I am very VERY lazy, and I only want to do it once.

Measure twice, cut once. Sure, it's more work up front, that leads to less work on the back end. And I LIKE up front.

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Thanks for the babes.
To answer your question. It is because he is messing with what he has and/or he wants to build a 318.
By following your logic, you show yourself as a hypocrite because of what is written below.

Just help the man build the 318!
why small block at all go straight to a 543?

Exactly! The freakin guy is messing with a 318, for anyone that doesn’t help him build a 318, STFU & walk away from the thread.
You non helping guys suggesting for a bigger and cheaper engine (340/360) are hypocrites and if you follow your own logic, you would have suggested something along the lines of an Indy max block and said stroke that till it hurts for the biggest and baddest displacement possible!

Everyone knows bigger is better for more power but do you all have to really hammer every 318 thread?

Why is it you can’t just help the guy with what he’s got?