my first engine rebuild (318) advises

For what you are doing I suggest the following.
Use your stock crank, rods, do a clean cut on the crank, normally .010/.010, recondition stock rods, re-use the stock rod bolts.
Up the compression with KB pistons, balance the entire bottom end.
Fresh valve job on the heads, with new valve springs.
Pick a cam according to how the short block mic's out for compression.
The intake you have does not really match the ports, but will work.
Summy carb is hit or miss but look really hard at the new 625 street demon carbs, I have one on my stock 318 and it gives good mpg.