1971 Dodge Demon Hemi install

Doc's right. Not that it'll matter to you for your build but the
last time I hefted a stock 426 cast iron exhaust manifold it
felt like it weighed 60-70 lbs (but, then I'm probably a weakling).

That's easily another 100 lbs on the front end. Aluminum heads can
save another 50 lbs and an aluminum block saves 220 lbs.

....Just Sayin.........