Domed pistons

It's going in a 99 swb 2wd 5speed truck. With 4.10 gears. I realize the heads aren't any where near ideal but they do have some port work done. And it's just going to be a week end toy to play with.
What 5-speed?
Ima thinking the 5-speed is gonna be the weakest link.
Since you didn't say; Ima guessing that Howards is 248/248 advertised. Ima thinking that's gonna be the wrong cam for this application. But what do I know.
You got a link or picture of those pistons?
I think I know what you are trying to do, and with a 318LA, it's kindof hard.