I've got a set of 186 heads currently on my 302. This winter I installed a -140 cam. The heads are in rough shape, essentially need a valve job, hardened seats, and guides. The local machine shop quoted me around $500-600 for that work. Am I better off putting the 186 heads on the shelf and...

I'm curious what you fellas think about this situation.... I advertised in TC's Parts Wanted section a few months ago for a matched pair of '186 heads, with dates consistent with my Z28 production. A TC member contacted me with a 'matched pair - same dates' for sale, which was dated close...