Restoring a 340 need advice

Losi said

Thanks. while disassembling the heads i noticed the seats were already changed for unleaded, also looked as some of the valve guides were sleeved. the valve job was def not done very nicely as the heights are not even at all. we will be making the seats all the same height. i do want a full new exhaust on it. I know its easier to keep the oe valvetrain but i want better haha. I just want it very smooth running without having issues down the road

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That is extremely important on a Mopar.....any engine really. All the Chevy boys never pay attention to that because they have independent adjustable rockers. ....and you cannot talk any sense into those guys. They think those engines are the best ever made. Getting the valve stems the same height and the rocker shafts in the correct place are two very important things to get right in the valve train. Most of the time, for absolute perfect geometry, the rocker shafts need relocating. Even on a stock build, it can make a noticeable difference. Mike from @B3RE can help you with that, if you decide to go down that route.