383 stroker build- I need some opinions!

[SeanPaintsFlames]

My current 350 in the K10 has really bad blow-by and I'm building a 383 stroker out of a spare 350 4-bolt-main, 2pc rms motor I had. The machinist calls the next day saying that the block I gave him yesterday has a bunch of cracks and would make a great coffee table. SO- where should I go from here?

I have 3 available 1pc rms blocks for $100, but then I'll have to get another crank for $200 and sell this new 2pc crank for $150, costing me $150.

I can get an already-bored 350 4 bolt main block off craigslist for $150, but I run the risk of buying someone else's junk. Again.

I try to use the block that is in the truck now, but I'll be out of a car for a couple weeks while the motor swap/build is going on. I'm not even sure if the engine in the K10 is for sure a 350 and not a 305 anyway. This will cost me $0, but take much longer.

What do you think? I already have a new intake, aluminum heads, roller rockers, gaskets, pistons, crank, cam, all bearings, etc. for this 2pc rear main 350.

??