Don't forget you need to check what clearance existed between piston & bore before deciding whether the bore is worth salvaging.
My own feelings are that head gaskets should never be used, unless as a packer in a spigotted arrangement. Often, simply by measuring the squish & CR, the head gasket can be eliminated by juggling with base gasket/packing, especially as thin metal base packings are available these days.
If your existing top end is salvageable, then I would advise to do so, to get back up & running.
However, if you have a hankering for a kitted engine, 150 crankcases are fairly plentiful & not too expensive. You could gather the parts you desire & build it @ your own pace. There should be some parts fairs available soon & a glut of parts waiting to be off loaded, what with the World & His wife kitting their engines......I would avoid the Indian alloy cylinders as they are rough as (how you say?) f##k
You can make them work very, very well if porting is your thing, because even I managed that. But you will need a right angle drive - say, on Dremel type tool - @ the very least & some very good burrs.
Much depends on your disposable income & whether your other half finds out.....