the cheapest option would probably be a st4s/s4r engine. big bore kits get pricey, splitting the cases to recrank pricey also. sps cammed 996 is a pretty good thing. i'm about to 1026 a 996 for a 916 owner that i think is a waste of his money, but he wants it.
the 916 runs up to 39 degrees max adv, the 996 runs up to 43, as does the sps. maybe they ran more in the bigger engines due to them being restricted somewhat in std form and could run more. i usually like to run around 37 to 38 max on most of them when they've ben opened up and had cam timing, etc done. most often there's no more power as compared to 42 or so but it can smooth them out. the 851 has 51 degrees std at 10,000rpm - there's a couple of hp in pulling that back to 40ish. i've run most of them down to 34 or so - 748r to 29 - and only my 851 has ever lost power compared to the best setting. the low and mid areas of the maps are fairly similar really.
so i wouldn't be worried running a 916 spark map in a 996. i usually add quite a bit of advance to the low throttle areas as they can be made nicer there with more, but you need to be aware of the idle spark line too and the effect you get if it's markedly different to the map at the throttle position the idle line is 'turned off' so to speak.
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