Just thought I'd share my buddy's B210 that he built recently. He unfortunately had to sell it but it's quite a sweet build. I'm planning to do the exactly swap into my 1979 B310
I do get passed a lot running the car with modern cars.
The motor I just built will probably be about 10-12hp more and I am toying with building up a full 1300cc motor with 38/33 valves. That motor would be around 95hp at the wheels.
The extra 20hp is enough that I'd be faster than 3/4 of the cars in that run group.