If you’re going to build your own and feel that you’re ready to dive into a stroker, let me suggest a 76mm stroke and 5.5″ rods with “B” compression-height pistons. With a 92 or 94mm bore, that’ll yield “only” 2021 or 2110cc but will have the advantage of being a standard-width package – that eliminates some of the headaches of a stroker. Clearancing will still be needed but it won’t be drastic, and the rod ratio will be a reasonable 1.84 (stock is 1.99).
It’s true that larger stroke crankshafts don’t cost much more, but there are hidden expenses and hassles that you don’t need on your first build. If this was to be a “thumper” for a Bus I’d go with at least a 78 stroke and deal with the packaging issues but you shouldn’t go over 78/78.4 stroke with stock-length rods – and you’ll still need to either shorten the barrels for “B” pistons, or add cylinder spacers for “A”s.
With 5.6″ rods an 82 stroke has a 1.75 rod ratio which’ll still have a reasonable life expectancy and won’t need ginormous intake ports to have any good top-end…but it’ll be more than ½” wider than stock unless you use some spendy custom pistons.
Also consider the effect that displacement has on C.R. – a really big motor needs some cavernous chambers, or perhaps custom dished pistons, if you want a C.R. that’s street-friendly on pump gas without excessive piston deck height.
I know you’ll get lots of other advice, some of it conflicting, but that’s my 2¢ ….and I reserve the right to say “I told you so”.