Well, it could have been worse.

The head showed many leaks (valve & otherwise plus 2 bad lifters) so off they came and my machine shop has fixed them up. Block is out of the car.

I have chased the block head bolt holes (lots of crap in there along with alu shavings) but have read about helicoil recommendations along with the drill guide for the off-axis bolts.

Not looking to buy another expensive tool I will only use once but...

How lucky should I feel about installation? Oil or anti-seize on the bolt threads?

I suppose I could try it and if anything strips pull off the heads again and helicoil the holes.

Another thing, are the head bolts reuseable or do they need to be replaced?

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)