Well I've sent the 4G56 crank off to be ground and should have it back late next week.
Total cost will be around $600 (including buying the crank for $175), which includes machining, grinding and after I finish the knife edging, a balance.
It's more than I was wanting to spend but in the long run, it will save me some time and money, ie: machining the pistons and purchasing/making a de-compression plate.
I could have just used the 2.0L crank but there is no replacement for displacement.
I should also be able to drop the cost by $200 next time (if this works out) by machining the mains myself before getting it ground to spec.
Currently I'm developing the rocker modifications.
1. Both the rockers and the posts will need to have sleeves with thrust surfaces.
2. The rockers will then be drilled and an oil channel will have to be machined, to allow oiling to the "swivel foot" tappets.
3. The spacers (instead of the spring retainers) will have to be measured and made. May also have to fix them to the rocker posts so they don't rotate.
Not much of an update but next week I will include a few more pics.
Cheers.