forged 360 stroker crank-recommendations???

Yup, an all domestic crank will cost...
I have used the mopar cast units in several builds with the cheap eagle rods, diamond pist in the past, good to hi 10s for a few seasons then the rods break. The cheap cast eagle is ok for lo po street use, bends easily and both are a pain to balance. The mopar looks to be made by scat.
I too wanted forged for my newest abomination so opted for the eagle. Nice piece for the $650 +/- went with the scat i beams (my personal preference for rods is an i) and the icon flat top pistons. Going in a .040 340 block, ed heads, *255/*259 .606/,618" solid flat cam w 1.6 sharp rockers.
Have done several 4" stroke motors with wiseco, diamond, and icon pist. Forget (my opinion only) the wiseco.
Diamond are nice for drag motor, but noisy and very little skirt for stability, the lower cyl wear is accelerated a bit.
The icons are quite nice for the $ and have a fair size skirt. Good choice for dual purpose street strip use. They also have reliefs for int and ex valve, unlike the wisco uninotch one slug does it all. fit and finish is comparable to more $ brands. Cant say how these parts will handle n2o or boost as i am strictly all motor guy.
As for the 4.25" crank: does it have the honda or quad 4 rod journal size? Eagle and ohio both have longer (6.2"+) rods avail for the small journal, most likely a chevy pin size. A few inches of block rock in the bottom of water jacket will deff help the lower cyl live longer in the production block.