| Your engine was a 748SP engine which I got off a guy in Sommerset, the bits I have are from a 748BP, but don't think there is much difference.
Main thing you notice between a SP and a BP is the oil cooler the SP has.
Valve sizes and cams may be different but I've never really looked into it,
You can have both barrells & pistons with all but one ring (as it broke) and the crankshaft with rods for £75, I also have a few other engine internals if you need them, | 
skidlids
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