Car tuning is a funny game... Saab know far more about turbocharging than I do, so I would be interested to see what the difference beteween the full fat turbo and the LPT are.
The phrase 'overblown' leaves me a little suspicious. LPT cars on the whole have a higher compression ratio than 'Turbo' cars, and you like the head bolts the length they are!
By all means research it but please be careful, I totally buggered the driveability of my BMW 635CSi by putting on a 6 branch manifold, mild (264 degree) cam and a K&N panel filter. It took a lot of rolling road and fuel pressure fiddling to get it right, and if I could do it all again I'd leave it alone!
Good luck with it though if you do go ahead...
Now, to look a using a Volvo 740Turbo bottom end with my 16V B234F head and a custom manifold on my 740GLT...
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale 3.0 Deore XT M730. 1992 Marin Pine Mountain Deore DX M650.
Retro road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 600 STI. 1993 Dyna Tech Ti.
Modern: 2006 Wilier scandium Ultegra 6600. 2014 Wilier GTR Ultegra 6800.