I have a stock 81 sport coupe. has a bad knock.
I was thinking of using a 4.1 in my rebuild and was wondering if anyone has tried that on the carbed cars.
my worry is California smog.
They actually do. Happened to a customer of mine with an older AMC. He basically did the same as the OP is asking about. Put a direct bolt in engine that had more displacement then what was ever offered in that car. Tech checked the casting that showed the displacement and failed.
Like Charlie posted, at a minimum grind off the displacement number.
I'm in Texas and we don't have to put up with the BS, but since I'm a tech I have to keep up with the BS that other states and the feds decide to pull.