Should I go Big block or Small block?

I have or had all of the engines mentioned in an A-body. Had a 440 Duster with 1.04" torsion bars, manual steering and modified K-member. Car was a daily driver for 8 years with excellent handling. The biggest problem was controlling the heat under the hood with all iron engine including HP exhaust manifolds. a couple of installation problems include the closeness to the master cyclinder and having to dent the hood frame because of engine height.
360 engines after 73 are thin wall castings and can be over bored only .020 without sonic testing. The first 360 MP crate grenaded in about 350 driving miles. The current 360 crate is smoking excessively with less than 5000 miles, still working on the problem. Rebuilt a 74 Duster with 318 for the grand son which pwerformed flawlessly before he decided to tackle a tree and the tree won. 72 /6 Duster was excellent performer. 72 340 kicks major butt, well balanced and will walk all over the 360 POS. The 383 in a 68 barracuda is a long time project car. All of this gibbersh is to say build the 340 for the most bang for the buck. Leave the 440 for another size car application. For any application up to 345HP a small block is fine more HP a low deck BB should be used.