Quote:

---

As a general rule, a wider LSA will lessen the overlap, thus giving a smoother idle and broader powerband. But, with that said, a cam with an LSA of 110 could actually have less over lap than a cam with 112 LSA. You just have to look at the valve timing events.

---

Overlap can only be changed two ways. LSA and Duration/split duration.

For instance if you wanted a 240* duration @.050cam on a 108 LSA Your overlap will be fixed.

You cant move the valve timing events around and change the overlap and have the same 240* @.050 cam on a 108 LSA



Further though Boost is Boost, But, Boost from a Turbo comes with more exhaust back pressure then a blown race motor requireing some different cam considerations.

Like you stated, sometimes not opening the intake valve 20* to 35* after TDC. The reason for this is that even after the exhaust valve closes the pressure in the cly may still be 10#+ So you need to allow the piston to travel lower in the bore to atleast to the equalizing pressure of the Turbos boost before you open the intake valve.

On a blown race motor your not going to have those kind of back pressure problems unless your running a highly restricive exhaust. Witch you wouldnt,unless your a fool

Back pressure can be reduced with turbos too by running a bigger turbo but you wont get the faster spooling you might want. Everythings a comprimise.

With the OP,s theoretical engine and 6# Mild boost Id run the bigger of the two small cams.

As a General rule BDS {Blower Drive Service} recommends when picking a cam for a mild blown motor. Pick it as if you were going going run it NA in the rpm range you want it to run at. They like 110 LSA for gas and 112 for Alchol.