The big question is this..........would you rather save until you have another 1,000.00 or see 2,700.00 laying on the asphalt in a puddle of oil under your car ?
Factor in block machining and hope and pray it doesn't spank a head and wreck something upstairs , you will have the potential to ruin a 4,000.00 bill in no time.
That is if it is kind and scatters in the first 30 feet of your pass.
Once you're out a couple hundred feet or better , you have a bit of momentum working against you too............and you bring the other lane into play too.
Scat recommends a lot of things.........and I can't think of a single car running a dry sump or blower that uses a cast crank.
But I'll bet they are out there.
As mentioned in other posts , a REALISTIC look at what you are going to be doing with it is first.
To be fast , you need to be safe.
And smart doesn't hurt either.........actually makes the first two a lot easier.
And that gem of wisdom is coming from a real dummy , so take it for what it's worth.