noob valve spring question

Another, less labor intensive way, to check the cam timing is check were split overlap is.
To do that You put #1 cylinder to TDC compression, then go to #6 cylinder.Split overlap should occur within a few degrees of TDC.
The usual way to measure this, is to lay a straightedge across the two lifters for this cylinder, and rock the crank back and forth until the straightedge touches all 4 edges of the two lifters, then taking up the chain slack in the normal direction, then reading the crank degrees, on a proven damper.
Of course in your case, the intake is in the way. So you will need to improvise. This is not rocket-science when you are looking for 35 degrees. You just have to eyeball the valves as one is going up and the other one, down. Then they reverse direction lock-step with the crank-reversal. . After a few rocks of the crank, you will get a feel for it and just guess as to a common amount of opening; then read the damper. It should be within a few degrees of TDC perhaps up to 5* advanced. But NOT double digits.
Happy hunting