You're planning on rebuilding it BEFORE combe?

Surely not?

I reckon you should just do the day on that lump, its only breathing issues after all, still goes well enough, and you can replace the worn out rings after.

Quite impressed how many miles that old motor has lasted TBH given the abuse it has had.

SteveBoySlim has some 87mm omega's in stock by the way.
Let me or him know if you need me to sort any machining out etc.