Old wrench guys.. just a quick 340 question.
Jim, I have several samples in the website Gallery of a couple of the chrome powders (Reflective Chrome and Super Chrome) that are available. In my opinion, the Super Chrome is the closest thing to chrome plating I've been able to find to date.
Unfortunately, your plastic dash bezel won't stand up to the heat necessary to cure any powder. Basically, anything that cannot withstand 450 degrees for a half hour will not be a good candidate for powder coating.
I'm working on some old nasty pot metal gauge bezels now -- from a '59 Impala --and have honestly been fighting with them nearly every step of the way as I repair and get them prepped. I'll let you guys know how they come out. The customer wants them done in the Super Chrome powder too.
You're right about the dash restoration service being expensive but, from what I've seen, those guys do a FANTASTIC job (especially CV Platers up in Canada). Combine their work with those gauge face stickers from White Gauges and your dashboard will look like it just rolled off the showroom floor.
There's a recent thread in the FABO forums entitled "powder coating" with a lot more info and pictures in there. (I don't wanna get a reputation as a thread hijacker!) Of course, any of you can call me for more info as you think of questions and save all the typing. I'm easy to work with.