Pics and stats where?
I was under the impression that D16A1 = P29. And of course, D16A1's were in all 86-89 tegs.
So here's what I found out: PG6B's have a dome of 1.5cc and a compression height of 30mm. This will produce a compression ratio of approximately 10.5:1 if the piston-to-deck clearance is zero. I don't believe you'll have problems with the valves hitting, at least not with a stock cam. People do use P29's/PM7's after all without problems. With an aftermarket cam, I know of no way to tell without knowing the exact clearance with the stock cam, and the extra valve lift on the new camshaft.