Are GM 3800 springs a direct replacemnt for beehive magnum springs??

Not sure....but a LOT of the valve springs fit several applications. For instance, this 454 I just built for this SS Chevelle I'm workin on takes the same spring as my 451 will, yet I put a hydraulic roller in the 454 and a mild solid flat tappet in the 451. The spring is the 924-16. That number is also good for the big block Ford. Probably other stuff as well. I know that didn't get your question answered, but it gives you some idea about valve spring fitment. Maybe someone can more specifically answer you.