New engine time - what should I do with the current one?

[petepetrolhead]

I think I'm about to go the nuclear route and have a clear out under the bonnet to make way for an LS3(!).

My current installation is a 5.0L Rover with V8D stealth cam and recently rebuilt standard TVR heads, a Rover Vitesse twin plenum with John Eales trumpet base, ACT performance manifolds, exhausts and racing cats, an Emerald ECU, coil packs and wide-band lambda sensor and ACT Big-bore induction hose and K&N filter. With all this lot together I'm getting 310bhp on the dyno.

Are these better offered as one complete package with a proven performance, or should I put the original plenum back on the engine and advertise the twin plenum, exhausts, ECU etc as individual items? I'm not sure which is the best way to get as much as I can to offset against the cost of upgrade.

Grateful for your thoughts...