Assuming that the newer version could flow more (which I have no idea if it does or not) it wouldn't increase power unless your existing one was already not putting out enough at the correct pressure. The injection pump puts out metered amount with each stroke of an element. Without increasing the size of the elements (and thus the amount of fuel delivered) no more power can be made. This is a moot point however since you have the non turbo version of the car, so even if you tuned the pump for more fuel, it wouldn't burn it because of lack of air.

Best thing to do if you want the maximum your engine can give is to check timing chain stretch and compensate for it with a woodruff key on the cam if necessary, make sure your pump timing is correct, and have the injectors tested for patter/flow/balence (odds are by this point they need rebuilding)

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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold