Electric die grinder and air die ginder*** Princess Auto. Give the Dremel to your wife.
( the bits sold at princess auto are not carbide, no good for porting cylinder heads ..)
Double cut carbide die grindering porting burr 's can be bought at many welding supply and industrial tool supply
stores. Not CTC. you want at least 1 with a long 5" 6" shaft to reach deep into the intake port to contour the valve guide boss shape.
Do a google search for David Vizard and cylinder heads. on amazon. buy the book(s).
" How to build max performance small blocks on a budget"
Read it, know it There will be a test.
You do not want to disable the vac advance. You want to retain it and adjust it to work correctly.
Get an adjustable vac adv.
Eastwood 6" carbide porting burr set
this is the one you must have to get dep in the port
"double cut" for cast iron,, single cut for aluminum.