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I've owned them both (74 911 2.7 & 82 911SC 3.0).
I bought the 2.7 with 30K miles and it started leaking oil thru the valve guides at 60K. Finally exploded doing 125mph when one of the valves wobbled bad enough to stick open, piston hit it on the next upstroke, exploded and took the finned casing with it. In a split second it had destroyed one entire piston, sleeve, wrist pin, rings, et all leaving just that incredibly strong connecting rod to proceed to enlarge the whole in the magnesium case. Spent $5000 in parts and machine shop work to put it all back together including new dilavar studs, etc. Later it developed more problems and I was never happy with it. To top it off the 74 was the least troubled 2.7 --- the 75 to 77s had those thermal reactors for exhaust and usually turned your engine into a Chernobyl nuclear reactor meltdown (heat-wise) without the radiation.
The 3.0 Porsche I bought from somebody who never changed the oil, allowed the oil lines to deteriorate to the point of my having 8 oil line leaks to fix (I replaced practically all of them including the thermostat), the plug wires are falling apart, the vacuum advance had a leak that was patched with silicone, some vacuum lines weren't plugged into anywhere, it backfired like crazy because the rich/lean mixture was way off, the timing was off, and it had about 130k miles on it. I've put another 25k miles on it --- but the basic engine it self? --- goes like a bat out of hell --- solid as a rock, despite incredible mistreatment by the previous (idiot) owner(s)!
I think you can guess my opinion on which way you should go!
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