There are some other things to consider when swapping to BBC. They are heavier than an SBC and this has a very large effect on things like stopping, handling, ride height, suspension wear. While some of the changes are not as noticeable, they are there and need to be considered. I put a 454 BB in a 78 camino I had and over one year, here's what I had to deal with:
- Ride height in front dropped jut over two inches as soon as the swap was finished.
- Lower ride height caused front to bottom out when road was rough and crushed the stop bushings after a couple of weeks.
- Replaced front springs with after markets rated over 100 lbs stiffer and replaced stop bushings with poly bushings. Ride height acceptable after this but wasn't really happy with new handling.
- Front shocks couldn't handle the extra weight and the ride went mushy right away.
- Driver side shock seal broke and started leaking about three weeks after change.
- Replaced front shocks with aftermarkets to correct ride.
- BB headers didn't fit right. Had to ding one drivers side tube to make fit.
- Fried the TH350 trans after just over 1,000 miles. Replaced with track built 200R4.($1200 plus shipping)
- Scragged front universal joint after trans was replaced and had to install new one.
- Driving the BB was less fun than a hot SB would have been because it was WAY too much motor for the way I drove the car. (323 single track rear)
- Because I didn't have the money to spend on other upgrades, I had the slowest BB in my town.
After just over a year, I swapped back to an aspirated SB put the BB in a friends 78 Malibu track car (which I got to make passes with too)
Ended up changing springs in the camino again to get back close to what I had originally.
My point is, changing to a BB is going to have an effect on other things, some of which may cost money you may not have or don't want to spend.
My experience with the BB has kept me from putting an LS in my 78 Malibu.
I don't know computers, I have a shi*load of early SBC parts and I like having an engine under the hood that I can fix without having to get someone else to answer questions about things I don't know.
Finally, as far as performance goes, I can run with most of the rodders in my town if you group us by total dollars spent.