I've heard of the aftermarket balancers cracking before and causing problems.. Might be the cause of the sound
As to the oil, did you put any silicone in the inside of the hb opening before you reattached it? What about the bolt itself? Both should get a light coat to prevent leaks
BV heads, P&P lower, comp 218/226 cam, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, SCT xcal2 (93 Ortizperformance tune), Windstar upper, 65mm tb, CAI, 8.8 w/ 3.73's, SFC's, cut springs, KYB shocks/struts, MM LCA's
blower/new cam soon
Dealer for Ortiz Performance, great tunes at a good price!