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having read and re-read the rule over recent years, my take on it is that if the car came with a crossflow then it should have a crossflow block, irrespective of which year that block came from, but shoudlnt have a more modern 16v engine or a pinto for instance. ive always assumed (and prepared to be wrong here...) that the rule was to allow some lattitude where the cars original engine may have long since expired and a replacement fitted, but not allow the 'wrong' engines to be fitted.
as for externally identifiable blocks, i again interpret that as the same 'family' of engines ie any pinto, but not a zetec etc.
to be fair how many people even know where the engine no's are on each make/model of block?? and how many can be seen when fitted in the confines of an engine bay?
as for 16v heads in modprod, so long as 8v and 16v blocks are externally identical, then i can see no issue.
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