Blasted? Powder coated? Tight budget? Daily Driver? Whoa there partner. None of that goes together. I've had more than a dozen old trucks and more than a dozen old cars. I have never powder coated a rim. I just paint them myself, you know, with a spray can or two, just on the outside. We are in Arizona you know? 6" of rain per year, no snow, no salt, no rust, just dust. You CAN NOT touch up powder coating.
A bucket sand blaster is cheaper than having rims blasted. Do it outdoors and wear a breather and hood. Mask off the tire and paint. Geeeze!
Tires: make sure you don't get more than 10 year old used tires. No tire place will touch them if you need mounted. Maybe it's 5 years. You don't say if your rims are original (hub cap clips) or later additions. You don't say if your rims are good or bad regarding rust, etc.
Chevy 6 hole pattern is universal. No problem there. 6 lugs on a 5 1/2 diameter hole pattern. The rest of the rim is another story. The center hole must fit, the widths and the offsets are different. Your's will be the best to use. I always switch to 15", so keep in mind your rollers can be 15". As long as they fit the drums and clear suspension parts. If you go disc in front, maybe 16" is better.
P.S. If this is a case where you just need rollers and the highway is a year or more away, why not get the flats fixed? Rollers are just for moving around the yard. If they only hold air for a few days, fill them up again.
If you don't have a big compressor, get one. Best investment on the world. Here is a blaster example minus %20 coupon.
http://www.harborfreight.com/portable-abrasive-blaster-kit-37025.html

And another: http://www.eastwood.com/blast-out-of-a-bucket-abrasive-gun.html

Budget method? No compressor? = Wire brush on a drill. Good exercise. The fun of restoration for a DD is doing as much as you can yourself and it saves money. You are already thinking the opposite. Having things done, Expensive!


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn