Gav, looks like you are on a winner with that pickup, that good old 186 banger will go forever.
Drop a crow torque cam in it while it's apart, or even a cam from an EFI (Black) six, they are much the same. 
The Cabstar five speed conversion pushes the motor forward by several inches, so i wonder if there is any need for mods to be done to the front of engine bay ie crossmember, radiator support panel etc. I know there is a four inch gain with a six cylinder engine bay, but i wonder if it's enough. Did you get to check out the engine bay of the vehicle it came out of? Rod (67Hardtop) might be able to help with the answer.
I may have some of the fitting instructions here for the Marks Conversion, i will check later.
Cheers, Mick.
1974 S3 88 Holden 186.
1971 S2A 88
1971 S2A 109 6 cyl. tray back.
1964 S2A 88 "Starfire Four" engine!
1972 S3 88 x 2
1959 S2 88 ARN 111-014
1959 S2 88 ARN 111-556
1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
REMLR 88
1969 BSA Bantam B175
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