440 power gains/ aluminum head advantages?

okay got it all apart, now just waiting on the mail man to pick up his pace ha. for reference in the pictures the chain has 1/2 in slack side to side from where my finger is at. am i the only one who feels like this is a lot for a new timing set? (comp cams double roller single bolt chain set)
also the dots are not lined up in the pic i know. i turned it a little after the pictures were taken and lined them up
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