I agree with Craig's thoughts on this.
My thoughts:
Because the head has been modified to accept the lumps, you will loose the gains they provide in performance, or possibly worse because of the big changes in port volume if you leave them out.
Each small bolt used to hold the lumps in are typically drilled by hand. So you might need to discover which lump goes into the correct port. I remember reading somewhere that you need to have one valve removed to get them in. When you remove a valve, number everything to make sure the valve and it's parts go back into the same hole. A valve spring compressor can be rented from a local auto parts store.
If you find you need to re-bed the lumps in epoxy when you re-install them, try to use an epoxy that is rated for high temperature. If you do use epoxy, dry fit everything before you glue them back in. McMaster Carr will have a nice selection of high temp epoxies to choose from.
I found this link that might help. It goes into detail the steps need to install the lumps. You can skip most of it because all you need to do is re-assemble:
Lump InstallationI hope this helps!
