I have a Roller LA project that my get Magnum heads, and your choice looks like a good bump from the stock Magnum 5.2 grind without getting too radical.
made the first start up and test drive last Weekend.... Jesus Christ on a bike, the thing pulls much stronger than expected..... still a lot of work to do, as the carb (600cfm Holley) is fucked up (those Things may happen when buying used parts, but nothing a bit of time and a rebuild kit cldn´t cure), also blown a header gasket and the oilpan gasket (several LA and Magnum pieces) is leaking. Just orded new Fel-pro-gasket for the oil pan and the headers to fix that.
but as far as i can say now... best and cheapest way to put more fun in your A-body
Spinning wheels by command whenever stomping on the loud pedal :blob: and you don´t have to invest thousends of Dollars (in my case Euros) to get a funny street car.
okay ... enough euphoria... time to get serious and ask more questions...
i will have 3 carbs which are on the shelf here now... which one would you tend to ?