In the end, the amount of money is of importance. My 17 year old son is funding this thing and isn't going to drop big $ on the valvetrain as he has to spread his meeger earnings on the whole build. If he can achieve the .555 lift on stock rockers it helps. If the Hughes retainers get us there great. If the other brand springs save $50. That is s big win.
We re budgeting this whole thing before buying ANY nonstock parts... So, if say this valvetrain ends up costing $300+. That might mean no headers, or do we have to go for a "smaller" cam to keep he headers.
This is a teaching moment about money, patience, compromise (on goals if necessary), knowledge, finding said knowledge and mixing it all together.
Im an AMC guy so I have to search for these mopar details along with him.