I played my '76 Fender P today along with Deep Purple's Pictures Of Home, just to hear what it sounds like (I can nail that sound with a Ric), and I came pretty close with the Fender (ash/maple/DR Lo Riders), without even tweaking the amp knobs. It's doable. If you hear the "Ric sound" in your head, you can make a P-bass sound close enough.
If you listen to Geddy playing on Exit Stage Left it sounds similar to a p-bass ...
My band was out playing last night ... I took 2 basses ... the p-bass pictured above and a 4003s5 ... I started with the p-bass and after 3/4 of a set I had to switch to the Ric ... the 4003s5 is better with a pick, better with fingers and better thumb slapping ...
Mark ... I usually use Seymour Duncan 1/4 pound or hot ... I am going to try the SD vintage as well ... Since I build my own p and j basses they never have covers ... plus you guys know how I love to palm mute ... covers get in the way for that ...
here's one with Seymour Duncan 1/4 pounders in it ...