hey man i would just buy a standard A14 and bolt it in ,its pretty muich a bolt in convertion ,but you might have to weld a plate of the engin mount to space the mount forwards to line up with the cross member ,and as for the carbys it could cost you up to 2000 depending on what carbys you buy and if they need rebuilding and what brand will depend on how hard jets are to buy

solexs are pretty hard to get but for me i got a good set do they probably dont need rejetting (pretty close to what it should be) and tey are pretty good gasket wise so im just going to leave them alone till they iether leak or fail otherwise