Good for you and working with your son! That is great!
OK, just look at coil spacing on a couple springs, (intake and exhaust) when you get the cam in. You won't see the problem when you put on the rockers and clamp them down; the lifters will likely be collapsed and not show this issue.
So you'll have to figure out a way to compress the valve and spring on the head by the amount of the valve lift for your cam; then check the coil spacing with a feeler gauge; you ought to be able to slip a .008"-.010" minimum feeler between the coils.
A SP VS510 is about the same as a Melling VS150 and those can be right at coil bind for .450" lift so you need to check for sure, because that is not adequate margin. .060" is the conventional wisdom for margin to coil bind, and you can often 'get away with 'a bit less until it gets over-revved. I.e., for a .450" lift, the valve should be able to move about .510" to coil bind. If the valve spring binds, then the likely results will be bent pushrods, with possible broken rockers.
Also, keep an eye on the retainer clearance to the valve stem seal and the the valve guide boss. This is easiest to check by assembling a valve, retainer and locks but no spring.
