Sounds like:
Your clutch is _gone_ and it's slipping hard. Usually slipping clutches will do their thing at low rpms and will stop at higher rpms. It causes the car to jolt hard back and forth like you described.
The clunk could be a tranny crossmember thats ready to check out and the jarring motions are causing the x-member to slap against the bottom of the car. I've had both of these things happen to me.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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