1994 3100 Open elbows size

[Salt shaker]

Hi all, I'm getting ready to order manifolds and elbows for my 454 crusaders.  The shop noted I have an older model and they are shorter than the new.  Difference is 1-3/4.  My friends 1996 looks to have both versions on port and stbd, so i think I'm ok.  Notes below from the shop.  I haven't actually measured it. Can anyone help me confirm the taller will fit?

Those are the very early elbows.
These were replaced by the taller R029015, they are 1-3/4 inches taller than what you have.
Do you have the hatch clearance?
If you do not have the clearance we’ll have to order the earlier elbow (98126)

thanks!

[Salt shaker]

Thanks to the help of a plastic knife i had on board, it looks like I have 3" of clearance. thanks