[unruhjonny]

I think the premise behind the idea was that the off the shelf forged 318 piston wouldn't require any additional block machine work - just a specific non-standard bore for a P350.
I do believe as mentioned earlier in this thread, it was suggested that the piston shouldn't require any modifications.
I believe that the 'off the shelf' 318 piston didn't require expensive rings, while the custom slug did require expensive rings.

You didn't forget that block work was a consistent cost factor here did you?
(if you haven't, what am I missing?)

I tend to follow threads like this, because I feel the P350 is not maligned per say, but more or less forgotten in leau of building a P400/P455... I think many have forgotten that the P350 responds very well to select builds - like what you have observed;
I'd wager few people really realize how easy it is to build a P350 that will surprise the pants off many other street motors.