340 retrofit hydraulic roller lifters

James Hurt said

It is plugged from the front. I’ve already purchased the lifters, cam and valve springs. I’ll drill holes in the passenger side and remove the plug from the front. Thanks.

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Before you install a set of retro hyd rollers do some research here on the forum regarding issues with retro rollers, there have been many reported problems with them. I myself just removed a set of junk Comp Cam retro rollers from my 340 and coverted it to solid rollers.
No more hydraulic lifters for this old Hill Billy.
To $ expensive and poor performance along with the noise.
Good luck