Top 5 A-body mods...

First five steps,?...
Fresh chassis,OEM style..
Upgraded drive line...( transmission, clutch, rear end)
disc brake ,front brakes,OEM style....
Subframe connectors, welded in..
Patience,in building a strong base,to build on.. Horsepower means diddly squat(& you look like a buffoon..other wise),unless you have a plan...