I hate being the buzzkill on this post but...........

Those speed pro pistons are absolutely horrible. They are extremely heavy and won’t do your old “maybe they will be ok with those heavy pistons stock connecting rods” . I’ve been doing this long enough to know that you really need to consider spending some money to build the 440 correctly.

Here are some bare minimums that I would consider mandatory:

Purchase lightweight forged pistons/ KB 237 piston would be a decent option as well to save money.

Have the stock rods resized with new ARP bolts.

Have the rotating assembly balanced.