Sure they will fit. But the 2.02" intake valve's and the bigger ports will hurt low end torque. It's been proven that smaller valve's along with good port work will give excellent results. A 318 will have to be spun at a higher rpm's in order to get the full benefit of the larger valve's and ports. I wish that a cylinder head company would offer a cylinder head especially for the 273 / 318, one that has 155 - 165 cc intake runners and 1.880" intake valve's and 1.600" exhaust valve's. Edelbrock has a cylinder head just for the small bore small block Chevy. A cylinder head that has good port velocity. The AFR165 heads for the sbf has 165cc intake runners and they have good port velocity. I believe that if they were to offer a cylinder like that that it would sell well as I've read on here countless times about guy's looking for good heads for their sbm. Sorry about high jacking this thread but I wanted to say what I thought and I'm probably wrong and some may disagree with me and I'm fine with that. Sometimes you have to create a demand.