318 build #2 "cost minded" for the '74 Duster

a-bodyguy said
when you add a 200 shot it will matter the question is how much prolly alot more then what they found na
hopefully soon i can say with my own build soon
my 318 from the early 80s picked up quite abit with headers as compared to manifolds and helped mpg
340 manifolds not so much on a mild engine
both those engines you quote have low compression as well
my 340 is a legit 9.99 comp ratio and a 8.3 dcr with a 218@50 454 lift 110 lsa ica 60 in at 106 it has a 68 340 drivers side and the jeep 2 1/8 pass side with a 3.91sg and a 650 dp it will smoke the tires all the way thru 2nd if i choose great street cam on 93 octane much more low end then the stock 340 cam

Just saying that pointing to that test and saying the HP manifolds or headers are worth only ___ hp is flawed. Put something better than the broomstick cam it came with in and make the exhaust the restriction and (I think) the differences will be greater. Which means the magazine test is useless when applied to something other than a 300hp crate motor beyond the generalizations that tube is better than cast iron.