Steve, you are correct on the mass of the Caddy fat-block, however the weight you have for the caddy is fully dressed with cast iron intake. Remove 35# if you go with an aluminum intake. Also, remove the mass of the freon compressor if you go without A/C

The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me