Here is some info....in 1969, I ordered a 1970 Camaro Z/28. Chevrolet was slow in coming out with the new Camaro body (that's why you see it referred to as a 70 1/2 Camaro). Mine arrived at the end of February, 1970.... it had the 350 LT1 engine. I had a buddy take me up to Denton, TX to pick it up. (my price was $3376 total). I needed to fill the tank before I drove it back to Dallas so I stopped at a Conoco station. The guy at the station had a 69 Z/28 with a "for sale" sign on it. It was less than 10 months old and had something like 6000 miles on it. So, I told him I would come back the next day and buy it. I did.
So, I had a 350 Z/28 and a 302 Z/28 at the same time. Same rear tires, same close ratio Muncie, same Holley.....the 350 would beat the 302.... even if I started out in 2nd gear in the 350. The 70 was heavier than the 69 but the 70 was faster. I tried racing my buddy (he drove one of my cars and I drove the other) Regardless of who was driving either car, the 70 always won.
48 cubic inches is significant.
Build a big motor.....you don't have to blab the size, just smile.