Yes, the design was sold to British Leyland, the motor was used in a hardtop MGBGT for UK use only in the mid seventies, the Rovers use a hybrid version to this day. The motor is still popular for street rods, performance boats, and US MGB conversions (the 215 is almost a direct bolt-in for the later "rubber bumper" cars ('76-'80). The all alluminium set up is light and provides good HP.
Oldsmobile also got a version of the 215. The short block was essentially the same, but the cylinder heads (and valve covers) are different, and take one head bolt more than the Buick version. This engine was used in the then-new compact cars, which shared parts among divisions but were each different than the others as well. Furthermore, Oldsmobile Turbocharged its version of the 215 for 62 and 63, in its Jetstar version of the f-85. The turbocharged 215 still had 10:1 compression, so a complex Rochester side-draft carburetor with alcohol injection was used to combat detonation. The little aluminum V8 produced one HP per cubic inch in turbocharged form. Pontiac's Tempest also was available with the Buick naturally aspirated 215, connected thru a torque tube to its rear-mounted transaxle.
I have a 4-bbl Oldsmobile 215, but am not sure what to do with it; I also have an original turbo and carburetor, but not the manifolds. It would be neat in a little street rod with no hood, I suppose.
The 215 is a small V-8 Aluminum Engine about 200 hp It has the appearance of a small nailhead with the 90 degree upright valve covers
The 231 is Buicks cast Iron bullet-proof V-6 which has been improved and developed and has become what is now known as the 3800 which have been the engine of choice in the Buick LeSabre and the Regal since about 1986 when Buick when with the front wheel drive platform in its full size cars ( shared with the Pontiac Bonneville and the Olds 88 in the late 80's and 90's. In 2005 it is still used as the base engine in Buicks LaCross and Lucerne.
Buick sold the right to it to Jeep I think as an odd fire and then bought it back and improved and developed an even-fire set-up added fuel injection and has been turbo-charged and super-charged with the economy of a v-6 30 mpg on the hwy and the performance of a v-8 about 200 hp S/c 240 the turbo generate quite a bit more and are very reliable and dependable and with proper maintenance a longevity of 2oo,ooo miles is easily attainable. Those Blocks are rock solid and some are being made that will quarantee 500 hp. That kind of hp in a v-6 (with twin turbos) is unheard of!
The reason Buick sold this engine to British Leyland was the "bean counters" at GM thought the engine was too expensive to produce. The British used this engine in the following cars, Rover, Land Rover, TVR, MG and Morgan.
The valve covers and the air cleaners on the '61 '62 V8 engines were painted with a wrinkle aluminum finish.