High Performance 318ci

273 said
Add better heads than stock for even more power, Trick Flow probably be over kill though.
The main problem with your original plan was way too much cam for streetable 318 power.
Most street cars will never see above 5000-5500 rpm 99% of the time, idle to 3000 rpm is where your mainly at.
So want a cam that works idle-5000 rpm with a lift that's make good use of chosen head, stock head .450"-.500", lift is more streetable power than duration.

You could also always add 4" stroke make the 318 feel more like a big block.

Why better head is overkill?
I only have experience with big blocks and the cam I picked seemed very small too me. I probably can have less duration cam with some lift custom made.

In my view if I have 750hp 470ci that needs 3500 stall converter it usually makes enough power and torque also down low. I don’t really need to push it all the time but when I want to accelerate fast I can do it.
Here I had similar idea of things. Wanted to be able to rev to just over 6000 rpm, but also having nice low rpm idle. I didn’t think about the weight of the car as for me the more power I have the lighter the car seems. Head flow, good intake and fuel source never failed me. I picked dual plane intake to bring the power band lower.

it’s like when you buy exotic supercar. You can get groceries and drive drive under speed limit all the time, but if you want to be fast you just put your foot down.