318 Stroker
Have done a search but not finding anything - maybe wrong search terms? Anyway, is there a chart somewhere that gives common combination of bore/stroke to yield final displacement for the 318?
Not sure about a chart however its like this with the std bores on stock stuff.
3.910" bore x 3.31" stroke = 318
4.000" bore x 3.31" stroke = 340
4.000" bore x 3.58" stroke = 360
Being as an intake will fit from 273 up to 360 inch engines its doubtful there is a deck height difference on the LA engines like you have between B and RB big blocks. All small blocks from the factory as far as i can tell use the same length connecting rods. The difference being the crank throw.
Theoretically put a 360 crank in a 318 to stroke it. Notice i said "theoretically" as a 360 crank will not physically fit a 318 or 340. Only because a 318/340 uses larger main journals, and the 360 crank is cut way undersized to be of any use. Hughes , eagle, and others do however make cast and forged stroker cranks to bump up the displacement of the 318. Most 318s cannot take a 4.000 inch bore however making the 340 block pretty prized.
The smaller bores on the 318 make valve shrouding a problem if running 2.02" - 1.60" valves. The stock magnum heads with larger valves than the LA heads though smaller than 2.02 - 1.60 valves strike a good compromise on a stroker 318. Engine quest make nice castings of these that are drilled for either an LA intake or a magnum intake.
Another option if you can still find them is old closed chamber 273 heads, but you have to do a lot of porting and upsize the valves, but are an option if trying to run 5 bolt valve covers.