Deciding on replacement intake (318, details in post)

Well time flies, I picked up and parted out an Aussie Valiant, worked on the bikes and got back into this. It’s been interesting and have filled in some of the blanks. I am wondering if I should rename this thread ‘engine rebuild strategy’!

The cam is not an Isky, it’s a Crane 691191. Quite a frisky grind for a 318 from what I’ve read…!

Heads are 360J heads, 915 casting (one B and one H). 66cc chambers from my ‘fill it and empty with a syringe’ measurement technique

273 rockers and adjuster pushrods. Solid lifters.

Pistons are plus .040. They’re pretty sooty so I’ll clean the tops to make sure they’re all the same. They’re flat tops with eyebrows, but have a slightly milled centre (I assumed it was for spark plug clearance and haven’t found another pic of any like it)

At this stage it’s only the bottom end to come out and it’s stripped.