He'll only need the 24# injectors if he starts to approach 300 rwhp.
350 HP (flywheel) is about 300 RWHP, assuming a 15% driveline loss. So, going from 225 to 350 will take a very well put together H/C/I combo along with other basic bolt-ons.
Have your friend do a little more research before he starts spending money that wont make his car go faster.
JMO,
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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