Hey y'all

This is my first post. Have snooped around here just reading around, seems like a good place for my stupid questions lol. So im building a motor. Ill throw all the info i can think of in here first. I was thinking of a 9+ compression motor. Its a 77 440-8 block, will be bored 30 over.
Its for in a 1991 d150 longbox. 3.55 suregrip. 727 auto. It has to run on pump gas, and be a very fun truck. No drag truck, will see the strip a few times a year just for the fun of it. Looking for low end power and torque mostly. So ive done a lot of thinking and research,and here what im thinking.
Summit 6400 cam
Holley 750 carb
Stock cast crank and rods
Stock 452 heads (hardened seats for pump gas)
Double roller timing chain
Melling oil pump
Stock torque converter
Fully rebuilt 9.25, 3.55s solid spacer
Eddy performer intake (or my stock one but you guys will probably change my mind on that)
Cant think of anything else right now.
So my question, what pistons do i get with that and will the setup im thinking work together nicely for a fun fast daily (not really daily bu you get the point) driver.
Thanks a ton, and please dont confuse me with 100 thousand different ideas lol but thanks for all input in advance