Buick 215

Both Buick and Olds had a 215ci engine ending in 63. The 64 Olds 300 is a cast iron block with Alum heads which will bolt on to replace the 215 heads. The 300 heads have larger ports and flow more and have larger valves. The block shown is a Rover block. They changed the block to add another bolt to each cylinder. If I remember correctly you can build a 4.6L engine using the 300 crank and some new sleeves to allow a bigger bore. Be sure and check some of the later Rover engines but study changes in each version.