If the OP absolutely has to change cams, then this is all the cam I would recommend for use with otherwise stock components and crummy heads....
Crane 113971 (H248-2)
Brute low end torque, smooth idle, daily usage, fuel
economy, 1600-2200 cruise RPM, 7.75 to 8.75 compression
ratio advised. (50 state legal, pre-computer, C.A.R.B.
Operating range 800-4600 rpm's
192/204 0.050" duration
248/260 advertised duration
0.400"/0.427" valve lift
I'm pretty sure that you'd find the stock intake duration back in the 170's somewhere, so 192 would be a substantial change. Always, always, always match the intake duration to the static compression ratio of the motor. You see that this cam calls for a static compression ratio of 7.75 to 8.75. We're pretty sure the stock motor fits into this bracket somewhere, so it should do a great job for you fellows and Mom will never know there's a hotrod cam in the motor.
The OP is hereby cautioned to read and heed this tutorial concerning the life and times of flat tappet cams in today's roller world.....
He is further cautioned to read and heed cautions about using a flat tappet cam with engine oil that has insufficient phosphorus and zinc.