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I'm not very familiar with the non-Volvo PRV-6 applications, but dropping a B280 into a Delorean as a replacement engine (and keeping the original B28 FI/Ignition/Intake) would require some custom fabrication since the intake manifold, heads, fuel injectors, and ignition system are all different and will not plug-and-play with each other (many modifications were done to the head when the B28 evolved into the B280, including removal of the distributor gear from the right camshaft). If you used a donor B280 and kept the B280 intake manifold, exhaust manifold, and distributor, you should be able to get it into a Delorean with out too much trouble. -you'll still have to deal with the problem of the K-Jet to LH-Jet Fuel Injection incompatibilites.
If you need the part numbers of the B280E camshafts, I believe I might have them at home in one of my service manuals. I don't think you'll get 20+ horsepower out of just a camshaft change (probably more like 7 to 10), but it's worth a shot. Also consider using the special straight-intake B280E heads (not used in all B280E engines, but some of them) if you're looking for better breathing in the top end of the RPMs. The B280F heads and some B280E heads havenswirl inlet passegeways just below the injectors that yeild better air/fuel mixture before reaching the valves. This does give better fuel economy and low end performance, but can be restrictive when trying to draw in large amounts of air at high RPMs. The special straight-intake heads were equipped to select B280E engines that were destined for markets/countries that had highways without speed limits (I.E. Autobahn/Germany, etc).
I don't know how many PRV-6 twin turbos are out there, but I heard a rumor that the Volvo R&D labs in Sweden built two functional prototypes. I don't know what happened to them or if the information was documented and relased to the public, but it might be worth following up on.
FYI, If you're looking for extra engines to play with, there's a guy on eBay who's parting out a pair of 780s right now. Email him direct if you'd like to pick up an engine or two.
Azureblue has a mentionable suggestion, it is possible to install a White-Block 6 cylinder from a 960 into an earlier 200/700/900 vehicle (it's been done by a few people). That multi-valve engine offers a lot of HP just in it's base form before modifications/porting/turbocharging.
God bless,
Fitz Fitzgerald.
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'87 Blue 240 Wagon, 262k miles.
'88 Black 780, PRV-6, 149k miles.
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