340 X heads advice

894 X's are only good for the resto folks that have to have them and should not be bought only for the letter. You can find a ton of 915 J heads for cheap and start from there, same basic head. I'd prefer a 1.88 head to start with if wanting 2.02's for the clean high and proud seat cut you can get on them. No sunk seats like a lot of the older factory 2.02 stuff.

I would not pay a premium for them. Bare... you're going to have a bunch of money in them by the time you are done.