I think getting those heads cut is the right way to go. I will give the engine shop a ring later to see how the case and crank got on and have a chat to them. I was planning on getting new exhaust valves. Would it be worth just doing new intake valves as well or trying to clean up the old ones and relapping them in? I think intake valves are around £8 each, so another £32 to do both. Quite a productive, if not frustrating weekend on the engine this week. Got the lower half of the engine assembled with gasgacinch on the case halves. Prior to this, I had test assembled the thing at least half a dozen times and I was sure that I had the con rods the right way up. A quick disamssemble and 180 degree flip soon sorted them out! Well the con rod fairies must've popped in over night and swapped them up the other way as when I was at the point of pushing the case halves together with the sealant on, I noticed the marks on them were facing downwards. I was going to lap the valves into place and set the heads up today as well. I'd bought new exhasut studs and went to take the old ones out. 5 came out fine, 3 are stuck fast - one of those snapped. The two remaining ones I cannot back out using the two nut trick as both back off the stud. So cutting them and drilling them out seems the only option. That gave me the hump, so I moved onto something a bit easier and honed the cylinders instead with the honing tool I bought. Had a go with a spare cylinder just to get the hang of it without risk of buggering up one of the ones I planned on re-using.
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