[Eljaro]

My 427 top oiler with Dove F5 aluminum heads and dove aluminum rockers is fine , but I have had already 3 broken (the cup at the top) pushrods I have found out that the pushrods were touching the bottom side of the hole in the intake manifold and hitting the ball on the adjuster screw of the rocker off axis, which is probably the reason for the cups of the pushrods to brake.
I have drilled a larger pushrod hole in the manifold(which seems to be a Blue Thunder ), inserted a tube and welded top and bottom. The aluminum of the manifold is very porous and difficult to weld , leaving allways some pore for water to seep into the engine.
Looks like after so much welding the manifold is starting to look ugly and starting to deform.
So here comes the question: the blue thunder manifold I have has 1.22"x2.25" ports. The edelbrock performer RPM FE manifold has 1.06"x1.75" ports and the size of the intake ports in the heads is 1.35"x2.05".
Will the Edelbrock (which is my choice because of price and availability) with this mismatch in port size work fine with those heads?
I do prefer low end torque to top end power , although 6000+ rpm can be seen very often in my outings.
Any suggestion from any of you?