You could but fuel line connections might start leaking a bit and Computer would being setting Rich codes
1997 and earlier are setup for max. 42 psi pressure, that's when FPR(fuel pressure regulator) on the engines fuel rail opens without vacuum assist.
1998 and up have FPR in the gas tank which is set for 65psi
Without any FPR on the system I am not sure what the upper limit for the fuel pump pressure would be, so fuel lines could start to leak
And the computer expects 30psi so open time for injectors is based on that, if it was 70psi then too much fuel flows thru injectors so computer would have to close them earlier, and that sets Rich code
And the engine would probably stumble quite often once computer adjusted to the higher pressure, because pressure wouldn't be stable when load on engine varied
As more fuel was needed say at 70MPH pressure would be less, say 50psi, then when you slowed down it would pop back up to 70psi, so computer would close injectors faster, then when you went to speed up again, Stumbling because injectors timing is off again
No, prbably not a good idea