Well,
@Gearhead88 : that machine shop will be me if I am going to cut the seats. I will make a custom guided cutter as required. Depth of cut is 7/32" ( 0.21875" ) max to avoid issues with the water passages. The Opel is not something too common a local shop would have seen many, if any of where I am.
@JohnW has one in Calgary and he is doing some wicked cool stuff to his - fuel injection, larger bore etc etc I brough my project back from Calgary in November
I "theoretically" have 2 heads to fart around with and the plan is to clean up the current valve seats and get back to OEM recommendations. As the original seats were a hardened part of the head it will be a check to see how much material comes off to clean up the seat. Just a couple thou and we are golden. That head would be put back into service to get the car operational and fun.
After that - plan 2. The 1.9 litre engine is able to get pumped up a bit to a 2.0 or 2.2 + with some modifications. Those would include bigger valves and larger bore pistons etc etc. The wallet would need some cash for that. I am y also be on the hunt for Opel #2