Does anyone know or know how to find out how much you can safely matching the spring pockets on a set of SB Edelbrock heads?

I’m at 1.680 and need to be at 1.860 so I need to matching .180 in the spring pockets but not sure if that’s possible.

Wade Metzinger 918-809-0987
71 Cuda 9.28@145 -1s, Pglide
68 Cuda 10.64@124 1.45 60's 318->390 eddys
Moparts discount code on WIX - moparts www.Filter1.com