sohc to dohc ka swap problems

[ls1240]

hey i have a 1990 240 hatch with 95 ka in it i recently did an sohc to dohc swap within 4 days with a friend now my problem is that at low end i have barely any power and between 5k to 7k rpms i have a big amount of power... when i drove the other car i had with this motor in it, it drove fine but when i did the swap it did not i did take out the air pump and the pipe that was on it i had to cut and i have not yet completely closed the hole so it leaks could that be my problem?? all my wires and everything is hooked up ive checked and i just have ran out of ideas can anyone help???? i dont think it is a fuel pump issue because why would i have no power at low end and have it at top end??????

[Gabes13]

What is the timing like on the motor? and yeah, close up any leaks you might have.

[ls1240]

sorry i havent answered back been busy but i havent closedmy leak completely but i did mess with the timing just really guessing and the motor runs alot better now idles ok and has a lot of pull but i have another downpipe that i can cut the air pump tube out and really get a good weld on it but im scared to take mine off because its so old im afraid the studs and bolts are gonna break on the manifold and thats the last thing i want..... any suggestions? other than rust inhibitor?