If you haven't spun a bearing and if the scoring runs around the circumference of the crank, you may be able to just replace the bearings if the scoring is not too deep (catch a fingernail). On a pure race car, bigger clearances are the norm anyway. Think of the scored crank as a fully grooved bearing in reverse.
Replace your oil pump with a good high volume pump if your not running tight street clearances (ie. scored crank). The bearing crap probably destoyed your pump anyway. I've always used Melling pumps and never had a problem.
If your crank is trashed just get a stroker crank and pistons while your at it. WTF, you've gotta pull the damn thing apart anyway.
Check your cam bearings! If anything flaked off they must be replaced and all of your oil passages brushed out. Check your rockers and shafts and clean the crap out them.
Actually, strip that block down and clean everything wether you have cam bearing damage or not.
Sorry man. This must suck.