How street able are these 340 stroker motors?
The price of the crank is a little steep. I have not checked prices lately, but when I built my stroker 4 years ago I got a Eagle steel crank for $650. As far as rods go, it is hard to beat the Scat I-beams for the money...4340 steel, light, strong, and relatively cheap (I got mine for $260 off Ebay).
Here is my build for my street/strip car if you are curious...and YES, it is very street-able in my opinion...but opinions vary.
360 block, 410 ci, pump gas, 10.8:1 compression
Eagle 4.00 steel crank, Scat I-beams, Diamond pistons, total seal rings (file fit),
ARP main/head studs, Edelbrock heads stage II ported by Ryan J @ Shadydell,
Small solid roller 248/254 duration w/ .576/.582 lift, Victor intake, Proform 750 dp
4.10 gears, spool, 35 spline axles, Caltracs, Monos, Calvert shocks
727, manual valve body, 8 converter, 28x11.5 Hoosier QTP
3200 lbs, street trim and with 3 inch Flowmasters.
My car runs mid 10s
but you could do something similar with a hydro roller, less converter, and non ported heads to make a nice low 12/high 11 second street car.
Basically, all you need is a plan and a goal in mind before you start, and build accordingly.