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I鈥檓 not sure what the point of putting a V8 in a Manta is. There are plenty of super quick cars that are a lot faster than a V8 Manta.
But the cars from the early 70s like the BMTroubleYou 2002, Alfa GTV & Datsun 510 are still super popular. A nice running Manta is now a unique & the best looking of these cars.
 

Detritus Maximus
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I don't know..the Alfa GTVs were pretty nice looking, even the GTV6.
 
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Opel Rallier since 1977
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IDK where the OP's thinking is at right now on this matter, but keep in mind that the tunnel will more likley than not need to be cut to accommodate an adequate trannie for a V8. The trannie tunnel in these cars IS a part of the structural strength in this chassis, so this cannot be done lightly and with some consideration for reinforcement. Then there is the matter of the driveshaft, and then the rear axle which is not especially strong.
 

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There was a thread a week or so ago, this kid put a v-8 an, olds engine, in a Manta, tweaked it correctly, flares etc, then before painting it, put it on Craigs list. Anyone else remember it and his name?
 

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A Buick Dauntless V6 could be pretty cool. You don't see that engine everyday and Opel was sold in Buick dealerships. These days, the Jeep crowd is where you'll find the most support for it. A V6 might just be perfect for a Manta. Not crazy enough to really have to worry about the power it will put out, but more power than a 4 cylinder CIH and unlike the TE2800, you don't have to worry about how long the engine is.
Take it from someone who has finished a V8 Opel Gt show car, and is in the beginning stages of a Buick 231 V6 2004R Ascona conversion. It is NOT an easy conversion. You will have to cut and paste a much larger transmission tunnel to begin with, then figure out how to best strengthen the frame to handle 200+ horse power. Then you have to figure out springs, brakes, and on and on. If you are to try the "Dauntless V6" swap, you'll find that there is not a whole lot of the old high performance parts left to make it really cool. Even living 1 mile from Summit doesn't help. I am still doing the "odd fire" engine, only because it is complete and I want that little bit of rock at idle. It should be fun, but BOY, what a lot of work!
 
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